/// <summary>
/// Get SCPI identity.
/// </summary>
/// <returns>SCPIIdentity object</returns>
public async Task <SCPIIdentity> GetIdnAsync()
{
string response = "";
// workaround: first request does not work sometimes, so retry once in this case
for (int retry = 0; retry < 2; retry++)
{
try
{
response = await scpiProtocol.RequestAsync("*IDN");
// dissect IDN string
SCPIIdentity identity = new SCPIIdentity(response);
// save identity object
Identity = identity;
break;
}
catch (Exception)
{
if (retry == 1)
{
throw;
}
}
}
return(Identity);
}
/// <summary>
/// Find all connected Active Load devices.
/// </summary>
/// <returns>Array of COM ports</returns>
public async Task <string[]> FindDevicesAsync()
{
string[] portNames = SerialPort.GetPortNames();
List <string> listPortNames = new List <string>();
foreach (string portName in portNames)
{
try
{
Open(portName);
// Probe device using SCPI request *IDN?
SCPIIdentity identity = await GetIdnAsync();
if (identity.Model.Contains("Active Load"))
{
Debug.WriteLine("Found device at: " + portName);
listPortNames.Add(portName);
}
Close();
}
catch (Exception)
{
// Continue with next device
Close();
}
}
return(listPortNames.ToArray());
}
/// <summary>
/// Connect to a specific device (if given) or to the first found Active Load device.
/// </summary>
/// <returns></returns>
public async Task <SCPIIdentity> OpenAsync()
{
if (PortName == null)
{
// Try to find first device and open it
string[] portNames = await FindDevicesAsync();
if (portNames.Length == 0)
{
// Nothing found
throw new DeviceNotFoundException("No device could be found.");
}
PortName = portNames[0];
}
Open(PortName);
// send an empty line to flush buffers
try
{
await scpiProtocol.SendAwaitResponseAsync("", 100);
}
catch (Exception)
{
// ignore errors in this case, they are expected
}
// get SCPI identity object
SCPIIdentity identity = await GetIdnAsync();
// check if device is calibrated
await GetCalibrationAsync();
return(identity);
}